''Ptychadena'' is a genus of

frog A frog is any member of a diverse and largely carnivorous group of short-bodied, tailless amphibians composing the order Anura (ανοὐρά, literally ''without tail'' in Ancient Greek). The oldest fossil "proto-frog" '' Triadobatrachus'' is ...

s in the grassland frog family,

Ptychadenidae Ptychadenidae is a family of frogs commonly known as the grassland frogs. These frogs occur in Sub-Saharan Africa. Ptychadenidae was previously considered to be a tribe or subfamily in the family Ranidae, but its position as a separate fami ...

. They are distributed in Sub-Saharan Africa, as well as

nilotic The Nilotic peoples are people indigenous to the Nile Valley who speak Nilotic languages. They inhabit South Sudan, Sudan, Ethiopia, Uganda, Kenya, the Democratic Republic of the Congo, Rwanda, Burundi and Tanzania. Among these are the Burun ...

Egypt Egypt ( ar, مصر , ), officially the Arab Republic of Egypt, is a transcontinental country spanning the northeast corner of Africa and southwest corner of Asia via a land bridge formed by the Sinai Peninsula. It is bordered by the Med ...

. The common names of this genus are ridged frogs and grass frogs. This type of family have many different characteristics such as the species, ''

Ptychadena neumanni ''Ptychadena neumanni'' is a species of frog in the family Ptychadenidae. It is endemic to Ethiopia. Its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist montane forest, subtropical or tropical mois ...

'' who have long hindlimbs and a large ear drum compared to the '' Ptychadena erlangeri, for example.'' They also have a unique bone structure which is a fusion between the presacral vertebrae and

sacrum The sacrum (plural: ''sacra'' or ''sacrums''), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1S5) between ages 18 and 30. The sacrum situates at the upper, back part ...

Species

The following species are recognised in the genus ''Ptychadena '':

References

Ptychadenidae Amphibians of Africa Amphibian genera Taxa named by George Albert Boulenger {{ranoidea-stub